What do you mean with "sunk"? I am used that aircraft might get shot down or destroyed by strafing. But sunk? Torpedoed by submarines they intended to chase? Fell victim to a surface battle? Pilots tried to do sea-landing too steeply? Uncommon in any case!

Yes. Before starting to get sizable amounts of equipment from Germany, Finnish AF was a maintenance nightmare, and the mechanics and the VL factory were really hard pushed to keep planes flying.

What do you mean with "sunk"?

Sunk does not mean due enemy action, they may have run in rocks or ice and been too far from the coast to be recovered by boat. As GregP suggests. May also have been corroded through since aluminium really does not like seawater.

Sunk does not mean due enemy action, they may have run in rocks or ice and been too far from the coast to be recovered by boat. As GregP suggests. May also have been corroded through since aluminium really does not like seawater.

Sunk does not mean due enemy action, they may have run in rocks or ice and been too far from the coast to be recovered by boat. As GregP suggests. May also have been corroded through since aluminium really does not like seawater.